I had a HDD failure. I replaced the HDD with a WD1600AAJB HD. I am running win98se on this unit and had reinstalled win98 and some programs after the initial boot. I am now unable to boot and have been getting CMOS checksum error, pressF1 this then moves on to as far as the system config screen where it checks everything, but it only progresses as far as the master HD coming up with CHS,UDMA,33, then stops. In BIOS if I try to set up hard disc it hangs with a figure 2 in the display. On initial start up it will pick up the model of the HDD and the cd drives etc. This HD does have a 8mb cache, would this be a problem? Help me please, Regards Mike

The most common cause of checksum errors in CMOS is a battery that is losing its power. You should pull the cmos battery and check its voltage with a volt meter. (It should read no less than 2.6 volts DC though 3.0 is recommended). Or just replace the cmos battery altogether. Viruses can also affect CMOS settings.
After checking the cmos voltage and or replacement of the cmos and while the system is powered down. Remove the system memory for about 1 minute. Doing this will remove any possible memory resident virus’s.
Download Western Digitals; Data Lifeguard Diagnostic for DOS (Floppy) or Data Lifeguard Diagnostic for DOS (CD)
WD's web site;
http://support.wdc.com/product/download.asp?modelno=WD1600AAJB&x=6&y=7
Use this software to setup you're hard disk drive.
You can also test the drive for errors and much more. Both of the above, floppy or CD are bootable and work in DOS mode. (Keep in mind all data will be erased). This is the best way to setup you’re hard disk drive before installing windows on it.

Cheers'
Mike